Seriously, don’t do this. If the aisle passenger is asleep, just wake them up. I actually talk this over before takeoff, esp. on a longer flight. If I’m window or middle, I ASK my rowmates how to best awaken them in case I must. If I’m on the aisle, I tell them how to wake me and insist they do so if I’m asleep and they need to get up. Honestly, no joke, if I awaken to find someone straddling me with a crotch or butt in my face, I can’t guarantee how I’ll respond.